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Area of Science:

  • Marine biology
  • Climate science
  • Oceanography

Background:

  • Climate change projections indicate significant impacts on marine ecosystems.
  • Global marine animal biomass is projected to decline, affecting fisheries.
  • Previous models (CMIP5) provided initial estimates of these impacts.

Purpose of the Study:

  • To project future ocean ecosystem responses to climate change using enhanced models.
  • To compare new projections with previous model generations (CMIP5 vs. CMIP6).
  • To assess the impact of different emissions scenarios on marine biomass.

Main Methods:

  • Utilized an enhanced suite of global marine ecosystem models (Fisheries and Marine Ecosystem Model Intercomparison Project - Fish-MIP).
  • Forced models with new-generation Earth system model outputs from Coupled Model Intercomparison Project Phase 6 (CMIP6).
  • Analyzed projected changes in global marine animal biomass and net primary production.

Main Results:

  • New ensemble ecosystem simulations project a greater decline in mean global ocean animal biomass compared to CMIP5-forced models.
  • This decline is observed under both strong-mitigation and high-emissions scenarios.
  • Elevated ocean warming is identified as a key driver, despite increased uncertainty in net primary production under high emissions.

Conclusions:

  • Projected climate change, particularly warming, poses a substantial threat to marine animal biomass.
  • Regional shifts in biomass changes necessitate localized adaptation planning.
  • Reducing uncertainty in marine ecosystem responses to climate change is critical for effective fisheries management and conservation.